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Multi-traveling-wave and composite zero-sequence current measurement line selection grounding protection system and method

A zero-sequence current and grounding protection technology, which is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, can solve problems such as difficult popularization and achieve the effects of improving operation safety, increasing success rate, and mitigating failure levels

Pending Publication Date: 2021-03-19
国网陕西省电力公司铜川供电公司 +2
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Problems solved by technology

Furthermore, due to the huge number of distribution network users, the application of these methods in the distribution network has a series of problems in cost, installation space, and organizational methods, making it difficult to popularize them in the distribution network environment

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  • Multi-traveling-wave and composite zero-sequence current measurement line selection grounding protection system and method
  • Multi-traveling-wave and composite zero-sequence current measurement line selection grounding protection system and method
  • Multi-traveling-wave and composite zero-sequence current measurement line selection grounding protection system and method

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Embodiment Construction

[0045] The invention provides a multiple traveling wave and composite zero-sequence current measurement line selection and grounding protection system. When a single-phase grounding fault that cannot be self-recovery occurs, the line selection resistance that is transiently input is used, and the switch generated when the resistance is input is used. Traveling wave and zero-sequence current models can quickly and accurately determine the faulty line. In addition, the line selection computer PB can control the resistance value of the input line selection resistor and its input time and frequency, reasonably adjust the zero-sequence current signal of the fault circuit, and at the same time additionally trigger current and voltage traveling waves, further providing executable line selection The number of times makes the success rate of computer automatic line selection controllable. After the fault line selection process is completed, the system will automatically exit operation ...

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Abstract

The invention discloses a multi-traveling-wave and composite zero-sequence current measurement line selection grounding protection system and method, and the method comprises the steps: quickly and accurately judging a line in a fault through employing a line selection resistor which is input in a transient state and a switching traveling wave and zero sequence current model which are generated when the resistor is input when a single-phase grounding fault which cannot be self-recovered occurs;.

Description

technical field [0001] The invention belongs to the technical field of power distribution, and in particular relates to a multiple traveling wave and composite zero-sequence current measurement line selection grounding protection system and method. Background technique [0002] Single-phase ground fault is a kind of common fault in power supply and distribution system, and the permanent single-phase ground fault that cannot be self-recovery has become one of the important reasons that affect the reliability of power distribution system. Due to the good time-frequency analysis ability and noise elimination ability of some contemporary mathematical methods, it is possible to accurately extract the traveling wave information in the fault transient signal and separate the interference signals such as white noise, so it can be detected in a short time faulty line. In addition, the development of modern electronic technologies such as digital signal processors also provides a har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/11G01R31/08G01R31/52G01R31/58
CPCG01R31/11G01R31/088G01R31/085G01R31/52G01R31/58
Inventor 李洋牛成林杨兰均常栋梁冯鹏勋张岩王亮刘晓波李迎华张鑫李瑞祥黄易之
Owner 国网陕西省电力公司铜川供电公司
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